Ok, I think I found the issue, recently I installed @Coderus trusted repo and I followed his instructions:
1. Download installer package: https://dl.dropboxusercontent.com/u/....0.1_armel.deb
2. Install it.
3. In terminal
Code:
apt-get update
apt-get install --reinstall aegis-install

So I don't know what got messed up with my apt that now I can't install anything unsigned if I don't use the aegis-dkpg command so I'll have to post on his thread to find out what is going on.